Free Developer Tools
Format, Validate, Convert and Optimize Data Online — fast, private and free. Everything runs in your browser.
Popular tools
The tools developers reach for every day.
JSON Formatter
Format, beautify and validate JSON with syntax highlighting and error detection.
JSON Validator
Check whether JSON is valid and pinpoint the exact line and column of any error.
JSON Minifier
Compress JSON by removing all whitespace to reduce payload size.
JSON Compare
Compare two JSON documents and see added, removed and modified values.
XML Formatter
Format and beautify XML with proper indentation.
Base64 Encode
Encode text or data to Base64.
Base64 Decode
Decode Base64 back to readable text.
JWT Decoder
Decode a JSON Web Token's header and payload.
UUID Generator
Generate random RFC 4122 version 4 UUIDs.
Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text.
Regex Tester
Test regular expressions against text with live match highlighting.
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
QR Code Generator
Create custom QR codes from any text or URL and download as PNG or SVG.
QR Code Scanner
Scan QR codes with your camera or by uploading an image — decode instantly.
Barcode Generator
Generate Code 128, EAN-13, UPC and other barcodes and download them.
JSON Tools
Format, validate, minify and convert JSON data.
JSON Formatter
Format, beautify and validate JSON with syntax highlighting and error detection.
JSON Validator
Check whether JSON is valid and pinpoint the exact line and column of any error.
JSON Minifier
Compress JSON by removing all whitespace to reduce payload size.
JSON Beautifier
Beautify and pretty-print JSON into clean, indented, readable structure.
JSON Compare
Compare two JSON documents and see added, removed and modified values.
JSON to XML
Convert JSON data into well-formed XML markup.
JSON to CSV
Convert a JSON array of objects into CSV for spreadsheets.
JSON to YAML
Convert JSON into clean, readable YAML configuration.
YAML to JSON
Convert YAML configuration into JSON.
CSV to JSON
Convert CSV rows into a JSON array of objects.
XML Tools
Format, validate and transform XML documents.
Web Code
Format and minify HTML, CSS and JavaScript.
HTML Formatter
Format and indent HTML markup for readability.
HTML Minifier
Minify HTML by removing comments and whitespace.
CSS Formatter
Format and beautify CSS with consistent indentation.
CSS Minifier
Minify CSS by removing whitespace and comments.
JavaScript Formatter
Format and indent JavaScript for readability.
JavaScript Minifier
Minify JavaScript by stripping comments and whitespace.
Encoding
Encode and decode Base64, URL and other formats.
Security
Decode JWTs, generate hashes and work with crypto.
Generators
Generate UUIDs, hashes and other identifiers.
Text Tools
Compare, diff and test text and regular expressions.
Time Tools
Convert timestamps and Unix epoch values.
QR & Barcode
Generate and scan QR codes and barcodes in your browser.
QR Code Generator
Create custom QR codes from any text or URL and download as PNG or SVG.
QR Code Scanner
Scan QR codes with your camera or by uploading an image — decode instantly.
Barcode Generator
Generate Code 128, EAN-13, UPC and other barcodes and download them.
Barcode Scanner Online
Scan 1D barcodes with your camera or an image and decode them instantly.
EAN-13 Generator
Generate valid EAN-13 retail barcodes with automatic check digit.
Code 128 Generator
Generate compact Code 128 barcodes for text and numbers.
Built for developers
A thoughtfully designed toolbox that respects your privacy and your time.
100% Private
Every tool runs entirely in your browser. Your data is never uploaded or stored.
Instant & Fast
No round-trips to a server. Results appear the moment you type or paste.
Works Offline
Installable as a PWA — keep formatting and converting without a connection.
Powered by Monaco
The same editor behind VS Code, with syntax highlighting, folding and search.
Start with a tool
No sign-up, no limits, no tracking of your data. Pick a tool and get to work.
Open JSON Formatter